Page 44 - MODUL SPEKTRUM FIZIK SPM

RADIOACTIVITY / KERADIOAKTIFAN

1. Diagram 1.1 shows the rate of decay of radioisotopes K and L respectively. The radioisotopes were
placed in front of a detector and the count rates were recorded every two minutes.
Rajah 1.1 menunjukkan kadar penyusutan radioisotop K dan L. Radioisotop-radioisotop itu diletakkan
di hadapan satu alat pengesan dan kadar bilangan direkodkan setiap dua minit.

Diagram 1.1 / Rajah 1.1

(a) What is the meaning of radioactivity?
Apakah itu keradioaktifan?

[1 mark / 1 markah]
(b) Name the suitable detector to be used.
Namakan alat pengesan yang sesuai untuk digunakan.

[1 mark / 1 markah]
(c) Based on Diagram 1.1,
Berdasarkan Rajah 1.1,
(i) Which radioisotope has a longer half life?
Radioisotop yang manakah mempunyai separuh hayat yang lebih panjang?

[1 mark / 1 markah]

(ii) Find the half-life for the radioisotope in (c)(i).
Show on the graph how the half-life is determined.
Cari separuh hayat bagi radioisotop di (c)(i).
Tunjukkan pada graf bagaimana separuh hayat itu ditentukan.

= ____________________________

[1 mark / 1 markah]

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